Help with burnt wiring smell? - JeepForum.com
 
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post #1 of 4 Old 03-18-2009, 11:02 PM Thread Starter
Bob97TJ
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1997 XJ Cherokee 
 
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Help with burnt wiring smell?

I cant figure out where a burning wiring smell is coming from.It seems to be stronger when my heater fan is on.it goes away after driving for a while.Ive now quit driving the jeep(97 tj 2.5) because i really REALLY dont want it to catch fire! I have not installed any thing electrical in a long time.I cant feel any warm wires or see anything smoking,help me out-

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post #2 of 4 Old 03-18-2009, 11:11 PM
Alexia
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It may be the switch in the dash melting or the fan resistor in the blower motor.

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post #3 of 4 Old 03-19-2009, 12:28 AM
Supertau
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2005 TJ Wrangler 
 
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I know this will sound wierd but I had the similiar problem with a car I had and I swear I was waiting for the damn thing to burn to the ground. The next time I changed the oil I noticed a walmart sack had attach itself to the h-pipe and was slowly melting onto the exhaust. Probly not the reason but something to look for anyways.
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post #4 of 4 Old 03-19-2009, 07:02 AM
gabriel05
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It's the blower switch, or the blower resistor. It's a pretty common problem to have them burn up on a TJ. Eventually some of the fan settings will stop working.
If you loose all the blower speeds except high then it's the resistor.
If you just loose random ones here and there then it's probably the switch.
This is caused by the brushes in the blower motor getting dirty/worn creating resistance thus making the motor pull more amperage. Replacing the resistor/switch is really just a band-aid to the problem they will keep burning up until you get a new blower. However blowers are expensive and the switch/resistor are cheaper so that's what most people do.
I installed a 20A fuse inline with the high setting on the blower switch. If I leave it on high too long it pops the fuse. This keeps it from burning up the switch, and fuses are cheap. I can go through a bucket of them and still be cheaper than the blower. The best fix without replacing the blower is to wire in relays (30A I think) for the different settings. Depends on how good you are with wiring though.

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